Lock for fastening pins



Aug. 18, 1964 K. RITTMANN 3,l44,693

Locx FoR FASTENING Plus Filed Jan. 22, 1962 INVENmR 4 /QI 8170844;

United States Patent O 3,144,693 LOCK FOR FASTENING PINS Karl Rittmann, Friedrichstrasse 126, Dusseldorf, Germany Filed Jan. 22, 1962, Ser. No. 167,501 6 Claims. (Cl. 24-158) This invention relates to a lock for fastening pins of brooches and the like.

Such locks for fastening pins have previously comprised a cylinder formed with a slot parallel to the axis of the cylinder to enable the introduction of the point of the fastening pin and a second cylinder slidably guided in the first-mentioned cylinder to move over the point of the fastening pin, a helical spring being disposed in the space between the outer and inner cylinders. The outer cylinder is provided with bracket means, to which the brooches are soldered. The abutments for the spring are formed in the simplest case by an inturned rim of the outer cylinder and an outturned rim of the inner cylinder. The grip plate provided With a short Screw-threaded stud is screwed into the inner cylinder. This lock cannot be asembled until the bracket means have been soldered to the brooch because the soldering heat Would soften the material of the helical spring, which is inserted before the soldering is performed. This softening would eliminate the spring force. This difiiculty is avoided according to the invention in that the spring abutment formed by the outturned rim of the inner cylinder is formed with a sawcut slot, through which the helical spring is threadingly inserted into the space between the cylinders after the soldering operation has been performed. The wire of the helical spring is pointed at one end and bent inwardly at the other end so that this end cannot spontaneously move out of the space between the two cylinders When it has been pushed into this space by means of a needle. The grip plate may now be soldered too.

The slot formed in the outer cylinder and extending parallel to the axis thereof has suitably a peripheral extension and the inner cylinder is suitably formed with a nose which is slidable in the slot of the outer cylinder. The extended inner cylinder may then be rotated to insert its nose into the above-mentioned extension of the slot of the outer cylinder so that the inner cylinder can be held in retracted position by the stressed spring. This facilitates the insertion of the point of the fastening pin. When the point of the fastening pin has been inserted into the outer cylinder, the nose of the inner cylinder is turned out of the extension of the slot and the inner cylinder moves under spring pressure over the point of the fastening pin.

The drawing shows by way of example two embodiments of the invention diagrammatically and partly in section. In the drawing,

FIG. 1 is a side elevation showing a brooch having a fastening pin lock according to the invention,

FIG. 2 is a top plan view showing such a brooch,

FIG. 3 is a longitudinal sectional view showing a lock according to the invention in locking condition on a larger scale than FIGS. l and 2,

FIG. 4 is a longtiudinal sectional view showing the lock of FIG. 3 in retracted position, also on an enlarged scale,

FIG. 5 is an elevation showing another embodiment of the pin lock viewed in the direction of the arrow in FIG. 1 and on a larger scale than in FIGS. 1 and 2.

FIG. 6 is a side elevation showing the pin lock of FIG. 5 and FIG. 7 is a longitudinal sectional view showing the cylinder of the pin lock of FIG. 5.

cice r In the drawing, 2 is a brooch, 3 a fastening pin to be locked. A bracket 4 of the pin lock is soldered to the brooch and to the outer cylinder 5 of the lock. The inner cylinder 6 is slidable in the outer cylinder 5 against the force of the helical spring 7 disposed in the space between the cylinders. The outturned rim 14 of the inner cylinder 6 and the inturned rim 15 of the outer cylinder 5 form the abutments for the spring. A slot 8 is formed in the outer cylinder 5 and extends parallel to the axis thereof to permit of inserting the point of the pin 3. According to the invention a radially extending nose 9 of -the inner cylinder 6 is slidable in the slot 8. Rotating the inner cylinder 6 When the spring 7 is stressed will cause the nose 9 to enter the extension 8 of the slot in the outer cylinder 5 to thus hold the inner cylinder 6 in retracted condition. By means of a grip plate 11, the inner cylinder 6 can be partly pulled out of the outer cylinder 5. In the embodiment shown in FIGS. 3 and 4 this plate is screwed by means of a Screw-threaded stud lt) into the inner cylinder 6 while in the embodiment shown in FIGS. 5 to 7 this plate is soldered onto the inner cylinder 6.

In both embodiments the outturned rim 14 of the inner cylinder 6 is formed With a saw-cut slot 12, through which one end of the helical spring 7 can be inserted and thereafter threaded through the slot into the space between the cylinders 5 and 6, so that the spring can be inserted after the soldering has been Completed. The end of the Wire forming the helical spring 7 is bent over at 13 to prevent the spring from spontaneously moving out of the space between the cylinders when the spring has been completely inserted into said space.

I claim:

1. A lock for fastening pins, which comprises a carrier, an outer cylinder secured to said carrier having a slot which extends parallel to the axis of said cylinder and is adapted to receive an end of a pin for insertion into said cylinder, an inner cylinder axially slidably disposed in and radially spaced from said outer cylinder and adapted to be axially extended from said outer cylinder so as to clear said slot, an inturned rim formed on said outer cylinder at one end thereof, an outturned rim formed on said inner cylinder at the end oposite to said inturned rim, and a helical spring disposed radially between said inner and outer cylinder and axially between said inturned and outturned rims and tending to retract said inner cylinder into said outer cylinder, said outturned rim being formed with a slot through which said spring can be threadedly introduced between said cylinders after said outer cylinder has been fitted over said inner cylinder.

2. A lock as set forth in claim 1, in which said helical spring is reversely bent at its end disposed adjacent to said outturned rim to prevent the spring from spontaneously leaving the space between said two cylinders.

3. A lock as set forth in claim 1, which comprises a grip plate disposed axially outside said outer cylinder and soldered to the inner cylinder at the end opposite to said inturned rim.

4. A lock as set forth in claim 1, which comprises a grip plate disposed axially outside said outer cylinder and threadedly connected to the inner cylinder at the end opposite to said inturned rim.

5. A method of assembling a lock for a fastening pin on a carrier, which comprises soldering to said carrier an outer cylinder having a slot which extends parallel to the axis of said cylinder and is adapted to receive an end of a pin for insertion into said cylinder, fitting into said outer cylinder an inner cylinder axially slidably disposed in and radially spaced from said outer cylinder and adapted to be axially extended from said outer cylinder so as to clear said slot, said outer cylinder being formed With an inturned rim at one end thereof and said inner cylinder being formed with an outturned rim at the end opposite to said inturned rim, said outturned rim being formed With a slot, threadingly introducing a helical spring through said slot in said outturned rim into the space between said cylinders, until the leading end of said spring engages said inturned rim, and pushing the trailing end of said spring through said slot in said outturned rim, Whereby said helical spring introduced into the space between said inner and outer cylinder after the outer cylinder has been soldered to the carrier Will not be subjected to heat during the soldering Operation and thus maintan its proper resiliency.

6. A lock for fastening pins comprising, in combination, an outer cylinder having a slot which extends parallel to the axis of the cylinder and which is adapted to receive an end of a pin for insertion into said cylinder; an inner cylinder disposed in and radially spaced from the outer cylinder and axially movable between a locking position fully inserted into said outer cylinder and an Unlocking position partly withdrawn Vfrom said outer cylinder in axial direction so as to clear said slot, an inturned rim formed on said outer cylinder at one end thereof, an outturned rim formed on said inner cylinder at the end opposite to said inturned rim, and a helical spring dsposed radially between said inner and outer cylinders and axially between said inturned and outturned rims and tending to maintain said inner cylinder in said locking position, a grip plate disposed axially outside said outer cylinder and fixed to said inner cylinder at the end thereof opposite to said inturned rim, said out-turned rim being formed with a slot through which said spring can be threaded into the space between said cylinders after said outer cylinder has been fitted over said inner cylinder.

References Citcd in the file of this patent UNITED STATES PATENTS 378,054 Johnson Feb. 14, 1888 685,214 Luthy Oct. 22, 1901 1,22S,994 Wacha June 5, 1917 1,397,236 Schenk Nov. 15, 1921 1,899,343 Mackey et al Feb. 28, 1933 2,057,006 Caccamise Oct. 13, 1936 2,675,606 Lawson Apr. 20, 1954 2,822,594 Scheemaeker Feb. 11, 1958 2,8%,286 Welschhof July 28, 1959 3,046,626 Khattar July 31, 1962 FOREIGN PATENTS 440,630 France May 8, 1912 587,009 France Jan. 12, 1925 791,523 France Sept. 30, 1935 1,006,749 France Jan. 30, 1952 

1. A LOCK FOR FASTENING PINS, WHICH COMPRISES A CARRIER, AN OUTER CYLINDER SECURED TO SAID CARRIER HAVING A SLOT WHICH EXTENDS PARALLEL TO THE AXIS OF SAID CYLINDER AND IS ADAPTED TO RECEIVE AN END OF A PIN FOR INSERTION INTO SAID CYLINDER, AN INNER CYLINDER AXIALLY SLIDABLY DISPOSED IN AND RADIALLY SPACED FROM SAID OUTER CYLINDER AND ADAPTED TO BE AXIALLY EXTENDED FROM SAID OUTER CYLINDER SO AS TO CLEAR SAID SLOT, AN INTURNED RIM FORMED ON SAID OUTER CYLINDER AT ONE END THEREOF, AN OUTTURNED RIM FORMED ON SAID INNER CYLINDER AT THE END OPOSITE TO SAID INTURNED RIM, AND A HELICAL SPRING DISPOSED RADIALLY BETWEEN SAID INNER AND OUTER CYLINDER AND AXIALLY BETWEEN SAID INTURNED AND OUTTURNED RIMS AND TENDING TO RETRACT SAID INNER CYLINDER INTO SAID OUTER CYLINDER, SAID OUTTURNED RIM BEING FORMED WITH A SLOT THROUGH WHICH SAID SPRING CAN BE THREADEDLY INTRODUCED BETWEEN SAID CYLINDERS AFTER SAID OUTER CYLINDER HAS BEEN FITTED OVER SAID INNER CYLINDER. 